排序方式: 共有6条查询结果,搜索用时 5 毫秒
1
1.
2.
This paper reports that the split ring resonators and complementary split ring resonators are compounded to construct a novel compact composite metamaterial.The composite metamaterial exhibits a unique property of blocking electromagnetic wave propagating in two directions near the resonant frequency.An example of two-element microstrip antenna array demonstrates that the developed metamaterial enables array performance that is an improvement in comparison with the traditional one,including mutual coupling suppression of 9.07 dB,remarkable side lobe suppression and gain improvement of 2.14 dB.The mechanism of performance enhancement is analysed based on the electric field and Poynting vector distributions in array.The present work not only is a meaningful exploration of new type composite metamaterial design,but also opens up possibilities for extensive metamaterial applications to antenna engineer. 相似文献
3.
根据引燃电极的性能要求,选取碳化硼、氮化硼等原料,采用粉末冶金法制得了无毒、引燃率高、性能稳定的新型引燃电极。然后用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了材料的微观结构,并分析了引燃电极成分、表面形貌及冷热电阻对电极的引燃性能的影响。研究表明:引燃电极主体材料中的碳化硼将增强电极的导电性能,氮化硼可以增加热导率并调节电阻,使电极在高温下保持较高的电阻而正常工作;表面形貌将影响样品的引燃性能,致密度高、孔隙率低的样品,其导电能力和耐压能力强,引燃性能好;引燃电极冷电阻的大小只能给电极与水银的接触情况和工作状态提供判断依据,给电极引燃性能的好坏提供粗略的参考,不能为其提供判断依据。 相似文献
4.
5.
An effective approach to expand the bandwidth of negative permeability of small-sized planar materials is proposed. Based on qualitative analysis of equivalent circuit models, the fractional bandwidth of an μ-negative (MNG) material is expanded from 3.53% up to 12.87% by adding split-ring resonators (SRRs) and arranging them by proposed steps. Moreover, the experimental results validate the effectiveness of bandwidth-expanding methods, which is promising for the extensive application of metamaterials in the microwave field. 相似文献
6.
根据引燃电极的性能要求,选取碳化硼、氮化硼等原料,采用粉末冶金法制得了无毒、引燃率高、性能稳定的新型引燃电极。然后用X射线衍射仪(XRD)和扫描电子显微镜(SEM)分析了材料的微观结构,并分析了引燃电极成分、表面形貌及冷热电阻对电极的引燃性能的影响。研究表明:引燃电极主体材料中的碳化硼将增强电极的导电性能,氮化硼可以增加热导率并调节电阻,使电极在高温下保持较高的电阻而正常工作;表面形貌将影响样品的引燃性能,致密度高、孔隙率低的样品,其导电能力和耐压能力强,引燃性能好;引燃电极冷电阻的大小只能给电极与水银的接触情况和工作状态提供判断依据,给电极引燃性能的好坏提供粗略的参考,不能为其提供判断依据。 相似文献
1